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Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Poster: 2D Materials

O 29.22: Poster

Dienstag, 19. März 2024, 12:30–14:30, Poster A

Linear and circular dichroism ARPES of the charge density wave material TiSe2 — •Hibiki Orio1, Maximilian Ünzelmann1, Jakub Schusser1, Kai Rossnagel2,3, and Friedrich Reinert11Universität Würzburg, Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence, Würzburg, Germany — 2Deutsches Elektronen Synchrotron DESY, Hamburg, Germany — 3IEAP and KiNSIS, CAU Kiel, Kiel, Germany

The transition metal dichalcogenide compound TiSe2 transforms into a 2 × 2 × 2 charge density wave (CDW) phase below 200K. The physical process governing the buildup of the CDW has been controversial. To understand the nature of this intriguing property, the hybridized orbital character involved in the CDW gap formation is crucial information. Recent studies show that linear- and circular dichroism (LD and CD) in angle-resolved photoelectron spectroscopy (ARPES) provides insights into the orbital texture of the initial states. Here, using ARPES in the soft x-ray photon energy range, we systematically study the LD and CD of TiSe2 in both the semimetallic and CDW phases.

Keywords: Charge density wave; ARPES; Dichroism; TMDC

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